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Albarede F, Blichert-Toft J, Vervoort JD, et al. Hf-Nd isotope evidence for a transient dynamic regime in the early terrestrial mantle. Nature. 2000;404(6777):488-90doi: 10.1038/35006621.
Albarede, F., Blichert-Toft, J., Vervoort, J. D., Gleason, J. D., & Rosing, M. (2000). Hf-Nd isotope evidence for a transient dynamic regime in the early terrestrial mantle. Nature, 404(6777), 488-90. https://doi.org/10.1038/35006621
Albarede, et al. "Hf-Nd isotope evidence for a transient dynamic regime in the early terrestrial mantle." Nature vol. 404,6777 (2000): 488-90. doi: https://doi.org/10.1038/35006621
Albarede F, Blichert-Toft J, Vervoort JD, Gleason JD, Rosing M. Hf-Nd isotope evidence for a transient dynamic regime in the early terrestrial mantle. Nature. 2000 Mar 30;404(6777):488-90. doi: 10.1038/35006621. PMID: 10761914.
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Nature. 2000 Mar 30;404(6777):488-90. doi: 10.1038/35006621.

Hf-Nd isotope evidence for a transient dynamic regime in the early terrestrial mantle.

Nature

Albarede, Blichert-Toft, Vervoort, Gleason, Rosing

Affiliations

  1. Ecole Normale Superieure de Lyon, France. [email protected]

PMID: 10761914 DOI: 10.1038/35006621

Abstract

Modern basalts have seemingly lost all 'memory' of the primitive Earth's mantle except for an ambiguous isotopic signal observed in some rare gases. Although the Earth is expected to have reached a thermal steady state within several hundred million years of accretion, it is not known how and when the initial chemical fractionations left over from planetary accretion (and perhaps a stage involving a magma ocean) were overshadowed by fractionations imposed by modern-style geodynamics. Because of the lack of samples older than 4 Gyr, this early dynamic regime of the Earth is poorly understood. Here we compare published Hf-Nd isotope data on supracrustals from Isua, Greenland, with similar data on lunar rocks and the SNC (martian) meteorites, and show that, about 3.8 Gyr ago, the geochemical signature of the Archaean mantle was partly inherited from the initial differentiation of the Earth. The observed features seem to indicate that the planet at that time was still losing a substantial amount of primordial heat. The survival of remnants from an early layering in the modern deep mantle may account for some unexplained seismological, thermal and geochemical characteristics of the Earth as observed today.

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